this post was submitted on 16 Jun 2025
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You don't double clutch on upshifts either (it was a drag race) so I'd say the parody is accurate
Uh.
I drove semi trucks in the US for years....
You'd better either double clutch or float those gears, because if you don't, you're destroying your clutch brake, which means you'll have trouble getting it into gear from a dead stop. That applies for both upshifts and downshifts.
Ever sit next to an old truck or bus and hear them grinding gears to get into gear?
That's due to the clutch brake failing to stop the flywheel.
All semi trucks in the US use synchro-less manual transmissions.
When shifting a syncro-less transmission, YOU are the synchro.
The clutch in these trucks has 2 positions. You either just barely engage the clutch enough to break contact, or you depress it fully to engage the clutch brake and (attempt to) stop the flywheel from spinning.
If you do the second one while shifting a moving vehicle, you're causing undue wear and tear on the aforementioned clutch brake.
Sure. But in the first Fast and Furious movie they're not driving syncro-less transmission semis. They're driving tricked out sports cars in a straight line and somehow having about 14 gear changes in a 6 speed manual.
While true, there are syncro-less racing transmissions as well for a number of the more popular moddable cars.